Reducing-valve for compressed-fluid motors.



E. SCHNEIDER.

REDUCING VALVE FOR COMPRESSED FLUID MOTORS.

APPLICATION IIVLED J'AN.27,1908.

903,325. Patented Nov. 10, 1908.

p1: :vnnms PETERS cu, WASHINGTON, u c.

EUGENE SCHNEIDER, or LE OREUSOT, FRANCE.

REDUCING-VALVE FOR COMPRESSED-FLUID MOTORS.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Application filed January 27, 1908. Serial No. 412,877.

To all whom it may concern.

Be it known that I, EUGENE SOHNEIDER, citizen of the Republic of France,residing at Le Creusot, (Saone-et-Loire,) France, have invented certainnew and useful Improvements in Reducing-Valves for Com ressed- FluidMotors, of which the following is a specification.

The present invention relates to reducing valves or pressure regulatorsfor controlling the supply of motive fluid to motors that are driven bya com ressed liquid or gas.-

The object of t e apparatus is to reduce to a predetermined extent thepressure of a fluid of any kind (liquid or gaseous) stored at a highpressure in a reservoir, so that this fluid may be employed in a motorin which it is necessary for the pressure of-the motive fluid always tobe constant when admitted to the motor.

In order that my invention may be clearly understood and readily carriedinto effect I will describe the same with reference to. the

accompanying drawing in which one constructional form of the apparatusis illustrated in section in Figure 1. Fig. 2 is a view in section of amodified detail.

a is the body of the a paratus, and b and c are two tubular membersleading respectively to and from the body; the fluid passing from thereservoir in which it is stored enters through the member I) andproceeds to the motor through the member 0.

d and e are two pistons connected by a rod n and capable of beingdisplaced in the body a; a cylindrical passage m extends through thepistons 05 and 6, their connecting rod n, and the counter rod f of thepiston e. h, i, is a cylindrical slide valve that is ada ted to move inthis passage; the portions and j are fitted so as to move in thispassage with a slight friction, and the portion 43 is of reduceddiameter. A spring 1" acts upon the upper portion p of the slide valve;the tension of this spring is adjustable by means of a screw 1, and itis inclosed in the casing g;

' In the piston e two ports Z and 7c are provided to place the lower andupper faces respec tively of the said piston in communication with theinner assage m. Assuming the spring 1" to have een compressed to a knownextent and that the parts occupy the position represented in thedrawing,-if the fluid passes into the member I) at a very high ressureit will fill the annular cavity aroun the reduced portion i of the slidevalve. As-

I compressed fluid.

suming that the pressure in c is n'iZ,-the portion j of the slide valvereceiving no pressure in the upward direction,the slide valve will bepressed right home in the downward direction under the influence of thespring 2. In this position the annular cavity around i will place theports I and k in communication with each other and the fluid at highpressure will be able to pass from b to the upper face of the piston c.

It having been assumed that the pressure upon the lower face of d isnil, the entire fluid distributer d, n, c, f, g, will be presseddownwards, and the piston d, in descending, will permit the fluid topass from b to c. The pressure in 0 will therefore increase; the fluidunder pressure will fill c and the lower portion of the passage m, andwill act upon the part j of the slide valve; the pressure increasing,the slide valve will ascend, compressing the spring 1 more and more; thepassage 7c will first be cut ofl by the part j of the slide valve, butas this valve continues to rise, it will be uncovered again; at thismoment, owing to fluid passing through the ports k and m, an equapressure will be es tablished upon the upper face of e and the lowerface of d; by reason of the provision of the counter rod f the pressurein the upward direction will be exerted upon a larger surface than thepressure in the downward direction, the entire fluid distributer d, n,e, f, 9 will ascend and communication between 0 and b will beinterrupted as soon as the piston d in rising enters the narrow portion0.

If the pressure in c (that is to say on the motor side) decreases, theslide valve h, i, j will again descend and the action described abovewill be repeated.

To sum up, the apparatus will act by a series of oscillationsduringwhich the pressure in the member 0 will preserve a substantiallyconstant mean value, and this mean value will correspond with thecompression of the spring 1" in the position indicated in the drawing,in which the upper face of the piston e is cut off both from the memberI) and the member 0.

It will of course be understood that the spring r may be re laced by anysuitable ne way of effecting this is shown in Fig. 2 in which thehead 1) of the slide valve acts as a iston working in a chamber 9supplied wit fluid at the desired pressure through a duct 8. An openingt permits atmospheric pressure to be maint ained on the back ofthis'piston; In order to cause the pressure in c to vary at will, it isonly necessary to modify'the compression of the spring 1, or thepressure of the fluid replacing this spring,

What I claim and desire to secure by Letters Patent of the United Statesis 1. In a pressure reducing valve, a valve casing having a highpressure inlet and low pressure outlet, a piston-valve within saidcasing comprising a valve member and a piston member, said membershaving faces exposed to reservoir pressure and balancing each other,passages in said piston-valve connecting the space in the rear of saidpiston member with said inlet and outlet and a slide piston-valve heldunder predetermined pressure working in said piston-valve to controlsaid passages and the movements of said piston-valve.

2. In a pressure reducing valve, a valve casing having a high pressureinlet and a low 'necting the space in'the rear of said piston memberwith said inlet and outlet, a slide valve piston held underpredetermined pres sure working in said piston-valve, and having a faceexposed to outlet pressure and subject to balanced reservoir pressure tocontrol said passages and the movement of said pistonvalve.

3. In a pressure reducing valve, a valve casing having a high pressureinlet and a low pressure outlet, a piston-valve within said casingcomprising a valve member a piston member and a tubular stem connectingsaid members, and open to low pressure, one face of said piston memberbalancing one face of said valve member against reservoir pres sure,passages in said piston member providing communication for the space inthe rear of said pistonv member with the high and low pressure sides ofsaidvalve member and a slide valve piston working in said stem and heldunder predetermined pressure to control said passages and the movementof said piston valve.

In testimony whereof I have affixed my J. DEs PoRrE, H. O. CoXE.

